Airtac MFJ Adjustable Mini Cylinder MFJ25X250-30
The AirTAC Airtac MFJ Adjustable Mini Cylinder MFJ25X250-30 is a genuine double acting, adjustable stroke JIS-standard round-body mini air cylinder with a Ø25mm bore and 250mm stroke, 1/8" air ports and a SUS304 stainless-steel barrel for mildly corrosive environments. For the same bore and stroke it is shorter than an ISO 6432 cylinder, saving mounting space.
- BoreØ25 mm
- Stroke250 mm
- Port size1/8"
- Acting typeDouble acting, adjustable stroke
- Rod threadM10×1.25
- CushionFixed TPU bumper pads
- No minimum order. A single piece can be ordered.
- Ready in 3–5 business days. That is the time we take to process the order and hand it to the carrier. Transit time after that depends on the destination.
About the Airtac MFJ Adjustable Mini Cylinder MFJ25X250-30
Trimming the extend stroke by up to 30 mm on site, the AirTAC MFJ25X250-30 lets you dial in the exact end position between 220 and 250 mm without buying a new cylinder or adding external stops. This JIS-standard round-body mini cylinder features a SUS304 stainless barrel and riveted aluminium covers, giving you a shorter overall mounting length than a comparable ISO 6432 unit while resisting mild washdown corrosion.
Driven by a 12 mm piston rod through a 1/8" port, the 25 mm bore delivers 245.3 N of push force at 0.5 MPa. That translates to a safe working load of roughly 147 N, or vertical lifts of about 12.5 kg with a 2:1 margin. Note this specific SKU lacks the -S magnet, so it cannot accept CMSG, DMSG or EMSG sensors.
Airtac MFJ Adjustable Mini Cylinder MFJ25X250-30 Technical Specifications
| Model | Airtac MFJ Adjustable Mini Cylinder MFJ25X250-30 |
|---|---|
| Series | MFJ JIS mini cylinder |
| Bore size | Ø25 mm |
| Stroke | 250 mm |
| Acting type | Double acting, adjustable stroke |
| Port size | 1/8" |
| Rod thread | M10×1.25 |
| Fluid | Air (filtered by 40µm element) |
|---|---|
| Operating pressure | 0.15 – 1.0 MPa |
| Proof pressure | 1.5 MPa |
| Temperature | -20 to +70 °C |
| Speed range | 30 – 800 mm/s |
| Cushion | Fixed TPU bumper pads |
| Max standard stroke | Up to 500 mm |
Specifications follow the official AirTAC MF/MFC (JIS-standard) datasheet. Barrel: SUS304 stainless steel; covers: aluminum alloy (round-body, riveted rolling-packed construction). Thread options: PT (blank) / G / NPT.
Theoretical Output Force (Ø25mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 245 N | 206 N |
| 0.7 MPa | 344 N | 289 N |
| Max (@1.0 MPa) | 50 kgf | |
Actual usable force is lower than theoretical due to friction and back-pressure. Size with a safety margin.
Model Code: Airtac MFJ Adjustable Mini Cylinder MFJ25X250-30
| MFJ | JIS-standard round-body mini cylinder (adjustable-stroke). |
|---|---|
| 25 | Bore size in mm. |
| ×250 | Stroke length in mm. |
| -S | Optional built-in magnet for CMSG / DMSG / EMSG sensors. |
MF-family variants: MF / MFC (double acting ±cushion), MSF / MTF (single acting push / pull), MFD / MFCD (double rod ±cushion), MFJ / MFCJ (adjustable stroke ±cushion). Back covers CA / U / CM. Mounting LB / FA / SDB / TC.
Where the Airtac MFJ Adjustable Mini Cylinder MFJ25X250-30 Is Used
Changeover Stations
Fine-tune the 220-250 mm extend endpoint on the fly during product changeovers, using the 30 mm adjuster to match new fixture heights without swapping cylinders.
Trial-Fit Rigs
Safely test end positions with a 147 N working load, dialing in the exact stroke during prototype commissioning before finalizing the mechanical stops.
Variable-Position Stops
Adjust the extend stroke on-site to act as a variable hard stop for light pressing tasks, leveraging the 245.3 N push force at 0.5 MPa.
Is the Airtac MFJ Adjustable Mini Cylinder MFJ25X250-30 the Right Cylinder?
When sizing this adjustable-stroke family, compare the real 0.5 MPa push figures: the MFJ20 yields 157 N, this MFJ25 provides 245.3 N, and the larger MFJ32 hits 402.2 N. Choose the 25 mm bore when your trial-fit rig or changeover station needs that mid-range thrust. The external adjuster is ideal for commissioning lines where the final stroke is unknown.
Mounting options include LB foot, FA flange and TC trunnion (no SDB or back-cover). Remember the fixed TPU bumpers only decelerate the stroke end—they do not lock the piston. If you need to hold a vertical load on air loss, add an external rod lock or pilot check valve.
Quick checklist
- ✓ Required force at your working pressure
- ✓ Stroke and mounting space
- ✓ Port/thread type (PT / G / NPT)
- ✓ Magnet (-S) for sensors?
- ✓ Back cover (CA/U/CM) & mount (LB/FA/SDB/TC)
Installation & Maintenance Notes
- check Use clean air filtered to 40µm or finer.
- check Keep within 0.15 – 1.0 MPa operating pressure.
- check Avoid side load on the piston rod.
- check Do not dismantle the riveted front/back covers.
- check Use correct back cover (CA/U/CM) & mount (LB/FA/SDB/TC).
- check Installation by qualified personnel per AirTAC docs.
Airtac MFJ Adjustable Mini Cylinder MFJ25X250-30 FAQ
This 25 mm bore cylinder uses a 1/8" port and a 12 mm rod. At 0.5 MPa it provides 245.3 N push and 206.1 N pull force. At 0.7 MPa it yields 343.4 N push and 288.5 N pull. The theoretical maximum force is 50 kgf at 1.0 MPa.
The external adjuster shortens the extend stroke by up to 30 mm on site, giving a usable 220-250 mm range. It sets the end position and does not act as a mid-stroke lock. The cylinder relies on fixed TPU bumper pads to decelerate at stroke ends. This SKU has no -S magnet, so it cannot accept position sensors.
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1-Year Warranty
Covers non-human-caused product damage.
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Standard models are processed and dispatched in 3-5 business days.
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